Crosscut saw



Patented Apr. 23, 1929.

UNITED STATES Tenor/ms o. BERG, or PRIEST RIVER, IDAHO.

CROSSGUT SAW.

Application filed December 10, 1928. Serial No, 153,865.

My present invention relates to improvements in cross cut saws oi thetype employed by wood sanyers in getting out timber from the woods forsaw mills, -telling trees, and cutting the trees or logs into lengths ofvarious sizes. As is well known to those jt'amiliar with this class ofwork. the cross cut saws now in use for this purpose require frequentattention of the saw filer and saw setter in order that the saws may bemaintained in erliicient working condition. In carrying out my inventionthe saw blade is crmstructed and the teeth are ttashioned in such manneras to eliminate the necessity for filing and for rc-setting the teethdue to wear, thus reducing the expense of maintenance of the saw andincreasing the time for which it is available for use. For this purposethe saw blade has a tapered shape in cross section with a thick Workingor cutting edge where the teeth are formed and with the minimumthickness at the baclr edge oi. the blade. This construct-ion alsoeliminates the possibility of binding or sticking of the saw withconsequent vibrations, and insures an easy cutting motion At its endsthe saw blade is fashioned with portions that are substantially thinnertha the body of the saw blade, "for use when a log lies upon the groundin such position that the walls oil the back of the kert are pinchedtogether thus preventing or renderii'ig diliicult the passage oi themain saw-bladebody through the hurt. lln such emergency one o'l" l'hethinner ends of the blade is drawn into the kert and the teeth of thisthinner end used to complete the cut.

in fashioning the working or cutting edge of the saw blade a radius isprovided for this cutting edge that insures a curvature by means ofwhich the reciprocating saw will follow the cut in the log or tree andthus avoid and prevent the undesirable rocking motion of the sawfrequently 'loiuul under existing conditions with saws now in use.

The cutting and raking teeth are arranged along the working edge oi thesaw blade in such manner as to insure eliieient cutting by the cutterstogether with proper clearance of the saw dust by the raker teeth fromthe kerf. My invention consists in certain novel combinations andarrangements of parts as will hereinafter be more fully set forth andclaimed.

In the accompanying drawings I have illustrated one. complete example ofthe physical embodiment of my invention wherein the parts are combinedand arranged according to the. best mode I have thus far devisod for thepractical application of the principles of my invention.

.Figure l is a view in side elevation of a cross cut saw embodying thenovel features of my invention.

Figure 2 is an enlarged view in side elevation at one end oi the sawblade.

Figure 3 is an edge view of the portion of the saw blade shown in Figure2.

Figure 4 is a. cross section of the saw blade at line QC-4t of Figurelthrough the cutting teeth.

Figure 5 is a transverse sectional view at line of Figure 1 through a.clearance space adjoining a raker or scraper tooth.

Figure 6 is an enlarged View of one of the series of cutting teeth.

In carrying out my invention the saw blade is fashioned with a main bodyportion 1 and two end portions 2 and 3, the latter of suiiicient lengthto be used in sawing the remainder of a log that has buckled and soclosed its lrerf as to render difficult the reciprocation therethroughof the body of the saw. The two end portions are of course provided.with teeth in practically the same arrangement as that used for the bodyof the i saw blade.

The end portions of the blade are 'fash ioned with bolt holes as 4, andthe usual hani'lles 5 and G are secured at the ends of the blade topermit manipulation by the sawyers in usual manner. Y

The cutting teeth for the body of the saw bl ado as well as for the endsof the blade are arranged in groups indicated as 7. of which preferablyeight teeth are used in a. group, with the teeth beveled alternately asat 8 to form the oppositely arrangei'l cutting edges.

The raker or scraper teeth 9 are much longer than the cutting teeth anda single raker tooth is located between a pair of groups of cuttingteeth "with clearance spaces 10 and 11 at the respective sides of theralrer tooth. By this arrangement of the cutting teeth and raker teethprovision is made for efliciency in cutting and for the proper clearanceoil saw dustfrom the lrerf being cut.

In Figures 1 and 4: the tapering form of the blade (in cross section)will be apparent and it will be seen that the opposed cutting teeth 7 inFigure 4 are cut from the blade without being distended therefrom as iscustomary in"setting the teeth. As the maximum thicknessot the bladethus occurs at the toothed edge and as the thickness of the bladediminishes from this edge to the back edge of the blade, it will beapparent that the teeth cut a kert wider than the body of the blade toinsure freedom of movement of the blade in the lien. Due to the bias cutor arrangement of adjoining cutting teeth as seen in Figure I the eethare automatically set as the work proceeds and re-setting on the part ofa workman is not required.

In actual practice the working or cutting edge of the blade may beone-eighth of an inch thick and the blade then tapers down to say onesixty-fourth of an inch thickness at the back edge 01 the blade. I alsolind that a. desirable curvature is fashioned for the cutting edge ofthe blade by using a radius or curve which drops say three-quarters ofan inch for each foot length of the blade.

From the above description taken in connection with my drawings it willbe apparent that I have arovided a cross cut saw embodying Variousfeatures by means of Which time and labor are saved in the manipulationor use of the saw and in which economy is socured in the maintenance ofthe saw in ellicient working condition.

Having thus fully described my invention what I claim as new and desireto secure by Letters Patent is- A cross-cut saw comprising a bodyportion merging by abrupt variations into end portion of materially lessthickness, the saw tapering in cross-section from a maximum thickness atits cutting edge.

In testimony whereof afiix my signature.

' THOMAS o. BERG.

